Crate Engine Builder Kit by Butler, 406-412 cu. in. Ready to Assemble
- Butler Performance Stealth/Stock Appearing Engine 390-425hp
- 3.75" Stroke 400 block
- Depending on core availability- 4.150, 4.155, 4.160, 4.181 Bore
- Cast or Forged Crank/ Forged Rods
- Custom machined and ready to assemble
- All blocks undergo the "Butler Process"
- Builder Kits are shipped unassembled. Must be assembled by you or your shop
Starting at 390-425 HP
ON PUMP GAS!
400 Block With Main Studs, Dip Stick
Cast or Forged Crank
Eagle Forged Rods
BP Forged Pistons and Pins
Total Seal Rings
C77 Race Bearings
BP Billet Gears and Chains
High Volume Oil Pump
BP/COMP Hyd Roller Cam
Hyd Roller Lifters
BP Custom Pushrods 5/16 .116" Wall
Edelbrock Out of Box or BP Built Edelbrock Heads
- Carb or EFI of your choice
Stock Type or Canton Oil Pan & Pickup
Port Matched Intake
TPP Valley Pan
Flowkooler Water Pump
New 11 Bolt Timing Cover, Plates, and Sleeves
- Engine Paint and Valve Cover Options
- All gaskets and stainless steel accessory and ARP fasteners
We start with the exact same blocks you would build on your own. It's what we do to take these old dirty blocks that you see here to a beautiful custom built Butler engine. It takes many critical steps in order to become the proper foundation to be a custom Butler Performance engine.
Step 1- 3 Step Cleaning Process
-Baked, Blasted, and Cleaned
Step 2- Visually Inspected
Step 3- Magnafluxed/Sonic Tested
Step 4- Replace Dowel Pins
Step 5- Align Bored (if required)/ Align Honed
Step 6- Bored and Honed with a Torque Plate
***Due to the fact that these 40 plus year old blocks cleanup of cylinders varies on a block to block basis. Therefore your final bore size will be determined at this step. Sufficient wall thickness will be verified once again regardless of final bore size. We will select the smallest bore available for your particular block unless you request a larger bore size/larger cu.in.***
Step 7- Square Decked
Step 8- Deburred/ Final Multi Prep Process
(It takes over a full days work for the final prepping process. Including tapping all bolt holes and cleaning all oil galleys)
Step 9- Final Jet Wash/Cleaning/Wipe Down
Step 10- Ready for Assembly
400 blocks with 557 castings are great blocks but the main areas were thinner than the standard casting 400's. This is not an issue whatsoever as long as you don't over stroke (4.00 str max) it or exceed the recommended hp levels (450hp). Otherwise these are great for strong economical street engines builds.
All rotating assemblies sold by Butler Performance, regardless of brand, are neutrally balanced in our shop by our experienced machinists.
Images show assembled with optional parts. Contact us for detailed quote for your application and specifications.
Drive, accessory pulleys, and March Serpentine systems sold separately
Air cleaner or drop base sold separately
Don't sweat the details. Once order is places one of the Butler Engine Tech's will contact you to finalize any details related to your specific car, application, and final details. Some of these details will be valve cover logo, breather location, and any other parts needed for your specific application. We will answer any questions you may have and get your build processed and in line for machining.
- Butler Performance
- Due to Popular Demand current lead time runs about 16-18 weeks Fully insured shipping will be quoted. (Usually $500-700 on average). Additional fees for residential and liftgate.
- Item Requires Shipping
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